Production of polyhydroxyalkanoates in open, mixed.pdf
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waterresearch44(2010)5196e5211Availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/watresProductionofpolyhydroxyalkanoatesinopen,mixedculturesfromawastesludgestreamcontaininghighlevelsofsolubleorganics,nitrogenandphosphorusFernandoMorgan-Sagastumea,*,AntonKarlssona,PeterJohanssona,StevenPrattb,NicoBoonc,PaulLantb,AlanWerkeraaAnoxKaldnesAB,Klostera¨ngsva¨gen11A,22647Lund,SwedenbAdvancedWaterManagementCentre,TheUniversityofQueensland,Level4,GehrmannLaboratoriesBuilding(60),BrisbaneQLD4072,AustraliacLaboratoryofMicrobialEcologyandTechnology(LabMET),GhentUniversity,CoupureLinks653,B-9000Ghent,BelgiumarticleinfoabstractArticlehistory:Inthisstudy,theproductionofpolyhydroxyalkanoates(PHAs)fromwasteactivatedsludgeReceived5January2010(WAS)wasevaluated.PHAswereproducedfromfermentedWASpretreatedviahigh-Receivedinrevisedformpressurethermalhydrolysis,astreamcharacterisedbyhighlevelsofnutrients(approxi-11May2010mately3.5gNL1and0.5gPL1)andsolubleorganics.PHA-storingorganismswere11Accepted15June2010successfullyenrichedathighorganicloadingrates(6gCODsolLd)underaerobicAvailableonline25June2010dynamicfeedinginsequencingbatchreactorsatasludgeretentiontimeof6dwithashortfeastlengthlessthan20%ofthecycle,andamaximumsubstrateconcentrationduring1Keywords:feastof1gCODVFAL.Thebiomassenrichment,characterisedbyadecreaseinspeciesPolyhydroxyalkanoates(PHAs)evennessbasedonLorenzcurves,providedabiomassthataccumulated25%PHAonadry-FermentationbiomassbasiswithyieldsonVFAof0.4CmolCmol1inbatchtests.ThePHAconsistedThermalhydrolysisofw70mol%3-hydroxybutyrateandw30mol%3-hydroxyvalerate,andpresented¼eWasteactivatedsludgehighthermalstability(Td283287C)andamolecularmassrangingfrom0.7toPHAproduction1.0106gmol1.OverallPHAstoragewascomparabletothatachievedwithothercomplexsubstrates;however,lowerPHAstoragerates(0.04e0.05CmolPHA1CmolX1h1)andproductivities(3e4CmolPHAL1h1)wereprobablyassociatedwithabiomass-growthandhigh-respirationresponsei